Catches two failure modes that each felled a previous spec-amendment
attempt: a fabricated Revokes-prior-text quote (text not in the file at
--base) and a normative line silently deleted with no quote at all.
Generic: any --glob x --base <sha> against any repo, with optional --tag
filter. Reuses the collapse() / quote_line_re() shape from the M33
reference, adds a Check D for deleted/renamed files (-M30 rename
threshold), and four violation categories: unquoted deletions,
fabricated quotes, malformed markers, deleted since base. Stdlib Python
only, --json output, --dryrun prints resolved config and still runs the
checks (read-only by nature).
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